STL list 报错this->_Mycont == 0

[dfbb]

有一段list操作的代码,assert在list里面的
const_reference operator*() const
{
if (this->_Mycont == 0
|| _Ptr == ((_Myt *)this->_Mycont)->_Myhead)
{
_DEBUG_ERROR("list iterator not dereferencable");
_SCL_SECURE_TRAITS_OUT_OF_RANGE;
}
}
调用代码(主线程中)如下:
Resource Find(const std::string& rkName)
{
for (ResourceItemList::iterator kIter = m_kResourceItems.begin();
kIter != m_kResourceItems.end(); ++kIter)
{
if (kIter->kName == rkName) //在这句报错
.............

传入rkName 是有效字串.
typedef std::list<ResourceItem> ResourceItemList;
ResourceItemList m_kResourceItems;
list的内容也有效

请达人解答下这个断言的原因.